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Middle Dry Fork Flume <br />WY 2015 Surface Water Quality and Field Parameters <br />Mountain Coal West Elk Mine <br />Monitoring Location: Middle Dry Fork Flume <br />Baseline <br />2015 Water Year <br />description <br />Units <br />Minimum <br />Maximum <br />Mean 4/25/2015 <br />5/28/2015 Q 8/19/2015 <br />Field Parameters <br />Flow <br />staff gage <br />0.22' <br />0.80' 0 34' <br />Conductivity (Field) <br />µmhos/cm <br />30 <br />480 <br />213 1 240 <br />134 105.1 <br />H Field <br />SU <br />7.80 <br />8.50 <br />820 832 <br />8.51 8.23 <br />Temperature Field <br />°C <br />3.6 <br />19.8 <br />12 4.2 <br />7.8 15.4 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab 3 <br />ACZ <br />Lab Reference # <br />L24635-04 <br />Sample Date <br />5/28/2015 <br />Lab Test Date <br />6/3-6/11 <br />Sampled By <br />PH <br />Alkalinity (Total CaCO3) <br />m /L <br />34 <br />270 <br />142 <br />Aluminum, dissolved <br />m /L <br />007 <br />0.07 <br />0.07 <br />Sum of Anions <br />meq/L <br />1 1 <br />1.1 <br />1 1 <br />Arsenic, total recoverable <br />m /L <br />0.002 <br />0.002 <br />0.002 <br />Bicarbonate as CaCO3 <br />m /L <br />34 <br />270 <br />142 <br />Calcium, dissolved <br />m /L <br />6.6 <br />56.6 <br />31.96 <br />Cation -Anion Balance <br />% <br />-22.2 <br />-22.2 <br />-222 <br />Sum of Cations <br />me /L <br />0.7 <br />07 <br />07 <br />Chloride <br />m /L <br />4 <br />1 <br />Conductivity @25C <br />µm os cm <br />76 <br />76 <br />76 <br />135 <br />Hardness as CaCO3 <br />m /L <br />23 <br />208 <br />115 <br />'ron, dissolved <br />m /L <br />0.11 <br />0.11 <br />0.11 <br />0.04 B <br />ron, total <br />m /L <br />0.16 <br />142 <br />314 <br />9.0 <br />Magnesium, dissolved <br />m /L <br />1.5 <br />176 <br />87 <br />Manganese, dissolved <br />m /L <br />0.029 <br />0.029 <br />0.029 <br />Manganese, total <br />m /L <br />0.01 <br />0.432 <br />0.11 <br />Nitrate as N), dissolved <br />m /L <br />0.57 <br />0.10 <br />Nitrate/Nitrite (as N) <br />m /L <br />0.57 <br />0.12 <br />Nitrite (as N), dissolved <br />m /L <br />0.1 <br />0.02 <br />pH <br />SU <br />67 <br />6.7 <br />6.7 <br />82 H <br />Phosphate <br />m /L <br />0.33 <br />0.33 <br />033 <br />Phosphorus, ortho dissolved <br />m /L <br />0 166 <br />0 041 <br />Potassium, dissolved <br />m /L <br />0.5 <br />05 <br />05 <br />Sodium Adsorption Ratio (SAR) <br />Calc. <br />0.47 <br />1 19 <br />078 <br />Sodium, dissolved <br />m /L <br />59 <br />388 <br />199 <br />Sulfate <br />m /L <br />50 <br />25 <br />Residue, Filterable (TDS)!2180C <br />m /L <br />50 <br />300 <br />172 <br />84 <br />Residue, Non -Filterable (TSS) 105 <br />mg/L <br />278 <br />72 <br />234 <br />Baseline and WY 2000 data adapted from WWE (2001). <br />2 Negative values denote readings below lab detection levels. <br />3 ACZ Laboratory, Steamboat Springs, CO <br />° ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value between method detection limit (MDL) and practical quantitation limit (PQL). The associated value is <br />an estimated quantity. <br />Shaded cells indicate parameters elevated greater than ten percent above the maximum baseline value. <br />West Elk Mine <br />B-5 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc. <br />